<template>
    <div class="sidebar">
        <el-menu
            class="sidebar-el-menu"
            :default-active="onRoutes"
            :collapse="collapse"
            background-color="#324157"
            text-color="#bfcbd9"
            active-text-color="#20a0ff"
            unique-opened
            router>
            <template v-for="item in items">
                <template v-if="item.hasChildren">
                    <el-submenu :index="item.menuId" :key="item.menuId">
                        <template slot="title">
                            <i :class="item.icon"></i>
                            <span slot="title">{{ item.menuName }}</span>
                        </template>
                        <template v-for="subItem in item.children">
                            <el-submenu v-if="subItem.hasChildren" :index="subItem.menuId" :key="subItem.menuId">
                                <template slot="title">{{ subItem.menuName }}</template>
                                <el-menu-item v-for="(threeItem, i) in subItem.hasChildren" :key="i" :index="threeItem.menuId">{{
                                    threeItem.menuName
                                }}</el-menu-item>
                            </el-submenu>
                            <el-menu-item v-else :index="subItem.menuId" :key="subItem.menuId">
                                <i :class="subItem.icon"></i>
                                <span slot="title" @click="addTab( subItem.url )">{{ subItem.menuName }}</span>
                            </el-menu-item>
                        </template>
                    </el-submenu>
                </template>
                <template v-else>
                    <el-menu-item :index="item.menuId" :key="item.menuId">
                        <i :class="item.icon"></i>
                        <span slot="title">{{ item.menuName }}</span>
                    </el-menu-item>
                </template>
            </template>
        </el-menu>
    </div>
</template>

<script>
import Vue from 'vue';
import axios from 'axios';
import VueAxios from 'vue-axios';
Vue.use(VueAxios, axios);
import bus from '../common/bus';
export default {
    data() {
        return {
            collapse: false,
            items: []
        };
    },
    methods: {
        loadData: function () {
            var _this = this;
            //初始化数据
            axios
                .get('/system/api/menu/selectMenuTree')
                .then(function (response) {
                    _this.items=  response.data.data;
                })
                .catch(function (error) {
                    console.log(error);
                });
        },
        addTab(path){
            this.$router.push({  path: path })
        }
    },
    computed: {
        onRoutes() {
            return this.$route.path.replace('/', '');
        }
    },

    created: function () {
        var _this = this;
        _this.loadData();

        // 通过 Event Bus 进行组件间通信，来折叠侧边栏
        bus.$on('collapse', (msg) => {
            this.collapse = msg;
            bus.$emit('collapse-content', msg);
        });
    }
};
</script>

<style scoped>
.sidebar {
    display: block;
    position: absolute;
    left: 0;
    top: 70px;
    bottom: 0;
    overflow-y: scroll;
}
.sidebar::-webkit-scrollbar {
    width: 0;
}
.sidebar-el-menu:not(.el-menu--collapse) {
    width: 200px;
}
.sidebar > ul {
    height: 100%;
}
</style>
